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PHILADELPHIA — Liberty Property Trust and Synterra Properties have announced plans to develop an $81 million build-to-suit office building at the Philadelphia Navy Yard for GlaxoSmithKline (GSK). Located at Five Crescent Drive within Navy Yard Corporate Center, the building will contain 205,000 square feet over four stories. It will be seeking LEED-Platinum certification. Vertical construction will begin this summer, with completion expected at the end of 2012 or beginning of 2013. GSK will relocate its offices at One and Three Franklin Plaza in Philadelphia's Center City district to the new building once it is finished. Robert A.M. Stern Architects is designing the project.